DESCRIPTIONS: This thermometer with double built-in high sensitivity high precision metal sheet to sense the temperature change in the environment. 3mm transparent acrylic plate is used as a thermometer dial and thermometer movement is wrapped with stainlesssteel shell and strong double-sided adhesive tape. The product does not have any battery. INSTRUCTION FOR USE: Tear off the protective paper on the double-sided adhesive tape. Hold the product and paste it on the window glass or door glass backhand, making sure the pasting position is straight. Close the window or door, then you can read theoutdoor temperature in the room. SIZE: Diameter about 11cm / 4.33in.Temperature measurement range: -40 ~ 50C, accuracy +/- 2C RAINPROOF?Due to its rainproof performance, the Outdoor Windowpane Thermometer will not be affected by the harsh environment. It can accurately and quickly measure outdoor temperature. AFTER-SALES SERVICE : Each product has passed the quality inspection before leaving the factory. If there is a problem, please contact the seller first, and we will actively solve it for you